Improvement in nut-locks



J. A. CAMP.

NUT-Locri. A

No.184,336`. Patented Nov.14. 187E.

M/fV

PATENT OFFICE JACOB A. CAMP, OF SANDUSKY, OHIO.

IMPROVEMENT IN` NUT-LOCKS.

Specification forming part of Letters Patent No. 184,336, dated November 14, 1876 application filed May 16, 1876.

nut-locks; and consists in the combination ofV devices and appliances hereinafter set forth and claimed.

In the drawing, Figure 1 is a longitudinal Y sectional view of a bolt With nuts which il lustrate my invention. Fig. 2 is a longitudinal sectional view illustrating a variation of my invention. Fig. 3 is a crosssection of the device shown in Fig. 2.

Heretoiore, in localities where the bolt is subject to jar-as, for instance, in a'tlsh-bar, or in bolts connected with machinery, or in the bolts employed to fasten the doors to oil-boxes ot' cars, and in other like localitiesthe nut is very liable to Work loose, and to run ott' from the bolt and become lost.

The object of this invention is twofold: rst, to prevent the nut from running off from the bolt, which is effected by forming a threadless recess in the bolt of a breadth slightly greater than the'thickness ot' the nut, so that when the nut works along the thread until it reaches the threadless space, it Will be held in this space Without Workingfarther off from the bolt. The second object to be accomplished is to eiect a more perfect security by a jam-nut or safety-nut,77 as it may be termed, by first running the ordinary nut upon the bolt until it passes the recess, then to run a jam-nut or safety-nut down beyond the recess until it jams against the nut in the ordinary way. If, however, the nuts should Work loose so as to run oft' from the bolt, the jam-nut would soon fall into the threadless space and be stopped, and at the same time the regular nut would soon work against it and become again jammed, so that the nuts would not be lost.

A may be any ordinary bolt. B is a threadthe shaftof the bolt, and the space is made,

preferably, somewhat broader than the nut that is run upon the bolt. Gis the nut.

Whenemployed alone it may be run down upon thebolt to the position shown in Fig. 1. 1f, then, it should Work loose, it would pass no farther than the recess B, because, as soon as it strikes into the recess B, it is no longer impelled forward. by the screw-thread, andthe chances are very slight indeed that it should ever engage exactly with the screw-thread on the opposite side of the threadless space, and thus run 0E altogether from the bolt. Therefore, in many localities-as, 'or instance, upon the oil boxes ot cars, where the nuts are frequently lost-th'e invention would be of great practical utility, inasmuch as the nut and bolt would not be lost, even though they might have Worked loose.

O is a jam-nut or safety-nut, which may be employed. In that case the nut O is run down on the bolt until it has passed the recess B. lhe jam-nut may then be run down over the recess B until itjams the nut O. If, then, the jam-nut O should work loose, it could only pass back as far as, and fall into, the recess B, when it would give a double protection against the loss ofthe 'nut O. Or, this invention may he employed in another way: rlhe nut O may be made regardless of the breadth of the space B, and reliance placed entirely upon the jam-nut O' and the space B. The only diterence would be if, as We will presume, the nut C was made thicker than the breadth of the space B, that the jam-nut or safety-nut C would alone, by falling into the space B, act as a safety-nut.

A variation of this invention is shown in Figs. 2 and 3, and is `designed for employment where it is desirable to multiply many times the chances of securing the nut O.

case the bolt A has longitudinal slots or grooves A', in addition to the threadless space or recess B. y

D are washers, and are provided with tongues d1 d2, so that these washers, which may be termed safety-Washers,77 can only be slipped down into the recess or against the in this nut C by permitting the tongues d1 d2 to slide in the grooves or slots A. When, therefore, they have reached the threadless space B, they may be turned to various positions in this space; and it is clearly apparent that the nut C cannot run off' except all these Washers be exactly registered, so that they may run oft' from the bolt A. The chances, however, are very materially lessened by makin g the tongues d1 d2, and their corresponding grooves A', of different breadths. Now, if the jam-nut C is also employed, a most absolute security is effected.

When the nut C has run down in place, and

the safety-nut C -then run down into the re' cess B, the nut C may be turned slightly back, tightening against the safety-nut. 0r, a rubber or other lexible washer may be interposed between the safety-nut and the nut C.

What I claim is-- 1. The nut-locking device, consisting of the bolt A, providedl with the recess B, substantially as and for the purpose described.

I2. The combination, with the bolt A, provided with recess B and the nut C, of the safety-nut C', substantially as and for the purpose described.

3. In combination with the bolt A, provided -with recess B, the slots or grooves A', and

`name to this specification in the presence of two subscribing witnesses.

J AOOB A. CAMP.

Witnesses:

LLOYD DEWITT, E. B. MACKEY. 

